CFD Online Logo CFD Online URL
www.cfd-online.com
[Sponsors]
Home > Forums > Software User Forums > OpenFOAM > OpenFOAM Bugs

aachenBomb erratic results

Register Blogs Members List Search Today's Posts Mark Forums Read

Reply
 
LinkBack Thread Tools Search this Thread Display Modes
Old   January 14, 2014, 17:11
Default aachenBomb erratic results
  #1
New Member
 
BigBlueDart's Avatar
 
Scott Ripplinger
Join Date: Nov 2012
Posts: 14
Rep Power: 13
BigBlueDart is on a distinguished road
I am helping somebody test the sprayFoam utility and they have been finding some pretty bad results running the aachenBomb tutorial when looking at liquid penetration length as reported in the sprayFoam output. When the data is plotted over time there are a number of spikes where the value goes extremely negative and then bounces back. In addition when he ran the code on 16 processors he got a completely different curve, but still with all the noise in the data.

I'll be taking a closer look at the results and the code to see if I can figure out where this is coming from, but I thought I would post about it here in case anyone is aware of this issue. If nobody responds, but I am able to find a solution I will post it here.
BigBlueDart is offline   Reply With Quote

Old   February 4, 2014, 12:46
Default
  #2
New Member
 
BigBlueDart's Avatar
 
Scott Ripplinger
Join Date: Nov 2012
Posts: 14
Rep Power: 13
BigBlueDart is on a distinguished road
Just thought I should come here to say that I determined that this was a bug in version 2.1 that appears to have been fixed in version 2.2. The results are largely similar with the exception of some major random outliers in v2.1. I'm guessing there was some bug in the lagrangian algorithms that screwed up the location of parcels, or something along those lines.
BigBlueDart is offline   Reply With Quote

Old   February 10, 2014, 16:40
Default
  #3
Retired Super Moderator
 
Bruno Santos
Join Date: Mar 2009
Location: Lisbon, Portugal
Posts: 10,974
Blog Entries: 45
Rep Power: 128
wyldckat is a name known to allwyldckat is a name known to allwyldckat is a name known to allwyldckat is a name known to allwyldckat is a name known to allwyldckat is a name known to all
Greetings Scott,

Sorry for the late reply, but yes, several bugs related to the Lagragian models and sprayFoam have been fixed in OpenFOAM 2.2. If you search for "sprayFoam" and "Lagrangian" here: http://www.openfoam.org/mantisbt/view_all_bug_page.php - you'll find that several bugs on this topic have been fixed in the past 1-2 years.

Next time, please also refer to which OpenFOAM version you're using It'll make it easier for those with little time to spot right away the problem, without having to do a few questions

Best regards,
Bruno
__________________
wyldckat is offline   Reply With Quote

Reply

Tags
aachenbomb, liquid penetration, sprayfoam

Thread Tools Search this Thread
Search this Thread:

Advanced Search
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
OpenFOAM - Validation of Results Ahmed OpenFOAM Running, Solving & CFD 10 May 13, 2018 19:28
lid driven cavity varying results yasmil OpenFOAM Running, Solving & CFD 2 October 6, 2016 22:42
interFoam simulation yields inconsistent results for alpha1 surface Ralinus OpenFOAM Running, Solving & CFD 8 January 13, 2014 09:54
CFD results not close to experimental results cider STAR-CCM+ 0 July 8, 2013 08:53
CFX cylinder or sphere benchmark results Mel CFX 1 August 8, 2005 19:47


All times are GMT -4. The time now is 06:05.